{
  "bibcode": "2007GCN..6224....1M",
  "body": "C. B. Markwardt (GSFC/UMD), M. M. Chester (PSU),\nJ. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester),\nN. Gehrels (NASA/GSFC), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA),\nF. E. Marshall (NASA/GSFC), C. Pagani (PSU),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nM. Stamatikos (NASA/ORAU) and E. Troja (INAF-IASFPA) report on behalf\nof the Swift Team:\n\nAt 03:53:53 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 070328 (trigger=272773).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 65.117, -34.069 which is \n   RA(J2000) = 04h 20m 28s\n   Dec(J2000) = -34d 04' 07\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a multi-peaked\nstructure with a duration of about 70 sec.  The peak count rate\nwas ~8000 counts/sec (15-350 keV), at ~3 sec after the trigger. \n\nThe XRT began observing the field at 03:55:21 UT, 88 seconds after the\nBAT trigger. XRT found a bright, fading X-ray source located at\nRA, Dec 65.1160, -34.0646 which is\n   RA(J2000)  =  04h 20m 27.8s\n   Dec(J2000) = -34d 03' 52.5\"\nwith an uncertainty of 4.7 arcseconds (radius, 90% containment). \nThis location is 16 arcseconds from the BAT on-board position,\nwithin the BAT error circle. The initial flux in the 2.5s image\nwas 2.6e-09 erg/cm2/s (0.2-10 keV). \n\nUVOT took a finding chart exposure of 100 seconds with the White (160-650 nm)\nfilter starting 98 seconds after the BAT trigger. No afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 100% of\nthe XRT error circle. The typical 3-sigma upper limit has been about 18.5 mag. \nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nXRT error circle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.04.",
  "circularId": 6224,
  "createdOn": 1175055281000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 070328: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 070328"
}